Using VirtualBox 1.5.0 OSE (1.5.0-dfsg-1 from Debian).
Here are the steps:
- install a Debian Etch as guest system
- after installation, check that network is working (ping another machine)
- take a snapshot
- ping again the same machine: does not work any more.
Rebooting the guest does not solve the problem.
modprobe -r pcnet32 ; modprobe pcnet32 does not solve the problem.
Halting the guest and starting it again solves the problem.
I use a bridged tun interface.
br0 8000.000cf1a5600d no eth0
tun-test
If I use tcpdump on tun-test, I see DHCP request from guest and answers from DHCP server. I suppose the problem is then receiving on guest. Same applies for ARP. Guest kernel is 2.6.18-5 from Debian. I suppose this is not a kernel problem since rebooting does not solve the problem.